Fixed Deposit calculation

Hello friends want to know how banks are calculating FD's. for eg. FD Keep for 399 days @ 7.75% for (senior citizen) rs 1 lakh MIS calculated rs 642/- and same amt kept for 333 days @ :7.90% for (senior citizen) comes to rs. 652. how banks are calculating this interest. I am not able to work it out. can anybody solve this.
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Quick Summary
This discussion explores how banks calculate interest on Fixed Deposits (FDs), particularly for senior citizens. The original poster is seeking to understand the exact formula used, as their manual calculations don't match the amounts provided by banks for FDs of varying durations and interest rates. Other users suggest using bank calculators and provide a basic formula for simple interest calculation.

Principal amount x Rate of interest x no.of days ÷ 365 or 366 days = interest amount per year

try bank calculator. formula will be there. 

If you calculated by it's simple formula

 
100000 X 7.75% = 7750 yearly Interest & if you divide by 12 it is coming around 645 & the same is for 7.90% 

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